updated to use a common logging library and enable log level configuration

Change-Id: Ib473615f25318c3b40cd6cf3bd49248e8a3d4fb1
diff --git a/switchq/vendors.go b/switchq/vendors.go
index d2a0cc8..c0de108 100644
--- a/switchq/vendors.go
+++ b/switchq/vendors.go
@@ -2,9 +2,8 @@
 
 import (
 	"encoding/json"
-	"log"
-	"strings"
 	"net/http"
+	"strings"
 )
 
 type Vendors interface {
@@ -43,7 +42,7 @@
 	for _, rec := range data {
 		v.Vendors[rec.Prefix] = rec
 	}
-	log.Printf("[debug] %v", v.Vendors)
+	log.Debugf("known vendors %+v", v.Vendors)
 
 	return &v, nil
 }